Do you have any pictures? You may get more help if people can see what it is you're looking for.

As for guns, that should be fairly easily. Hit a toy store and look through their toy guns and you should be able to find something you like, then you can just paint it up. I've seen plenty of toy guns that look like pistols, bazookas, shotguns, machine guns, even AK-47s. I once saw a tripod gatling gun at K-mart that I still regret not buying...

Remember to always leave the orange tip on the end of the gun so you don't run into any problems at conventions.

omfg Vaas MADE that game. Definition of insanity and all that lol. In any case I have a lot of tutorials that could be hand for you making the guns and making Dovahkiin as well (depending on what armor set).

You can use the methods for Lux's staff (stacking and carving) to make mechanical shapes like the 3DMG I'm making.

Additionally I'll have Tryndamere's build up in a week or so, and people kept yelling "FUS ROH DAH" at me, so it's a reasonable facsimile of Dovahkiin methinks lol. But for now here is my Monster Hunter build whose principles I used in Tryndamere.